Universal Asynchronous Receivers & Transmitters

Universal Asynchronous Receiver-Transmitter, more commonly referred to as UART, is a type of serial communication interface. UART’s primary function is to transmit and receive data via a data bus. It allows two devices, such as computers, to carry out data transmission over a wired connection. UARTs convert incoming and outgoing data bytes into a serial bit stream.


These particular UARTs are stand-alone integrated circuits (ICs). However, you can also find UARTs within microcontrollers (MCUs).


UART ICs (integrated circuits) are semiconductor devices which can be integrated into your electronics designs to enable UART communication. UART is a popular method of communication in electronics projects. It enables computer hardware to communicate with other modems and serial devices.


When choosing a UART IC, ensure that it meets the requirements of the modem transmission rate.



What does a UART consist of?


One side of the UART feature around 8 data lines and the control pins. The other side of the UART has two serial wires, the Transmission (TX) and the Receiving (RX).



Communication Standards


UARTs may feature a communication standard which defines the signals between devices. These standards include RS-232, RS-422 and RS-485.



What is baud rate?


UART baud rate is the speed at which the data is transferred which is given in bits per second (bit/s or bps). The devices that you are communicating between should both have the same baud rate.



What does Asynchronous mean?


Asynchronous is a type of serial communication where the interfaces at each end are not synchronised by a common clock signal.



What is USART?


USART is very similar in functionality to a UART device. However, it also offers the possibility of a “synchronous” mode.


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Description Price Number of Channels per Chip Standard Supported Transmit FIFO Receive FIFO Maximum Data Rate Transmitter and Receiver FIFO Counter Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Length Width Height
RS Stock No. 786-1001
Mfr. Part No.MAX3140CEI+
BrandMaxim
SGD12.67
Each
units
1 RS422, RS485 - - 230kBd - Surface Mount QSOP 28 4.75 → 5.25 V 9.98 x 3.99 x 1.5mm 9.98mm 3.99mm 1.5mm
RS Stock No. 173-0790
Mfr. Part No.XR20M1170IG16-F
BrandEXAR
SGD4.28
Each (In a Tube of 95)
units
1 IrDA, RS232, RS422, RS485 64B 64B 16Mbit/s Yes Surface Mount TSSOP 16 1.6 → 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm
RS Stock No. 686-6055
Mfr. Part No.XR82C684CJ/44-F
BrandEXAR
SGD23.08
Each
units
4 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 913-4234
Mfr. Part No.ST16C554DCQ64-F
BrandEXAR
SGD10.93
Each (In a Tray of 160)
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 913-4253
Mfr. Part No.XR16L784CV-F
BrandEXAR
SGD22.237
Each (In a Tray of 160)
units
4 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 797-4765
Mfr. Part No.SC26C92C1A
BrandNXP
SGD12.01
Each
units
2 UART - - 230.4kbit/s Yes Surface Mount PLCC 44 5 V 16.66 x 16.66 x 4.06mm 16.66mm 16.66mm 4.06mm
RS Stock No. 888-8729
Mfr. Part No.FT231XQ-T
BrandFTDI Chip
SGD2.249
Each (In a Pack of 10)
units
- - - - - - Surface Mount QFN 20 - 4 x 4 x 0.75mm 4mm 4mm 0.75mm
New
RS Stock No. 190-1351
Mfr. Part No.MAX3107ETG+
BrandMaxim
SGD11.525
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbps Yes Surface Mount TQFN 24 2.35 → 3.6 V 3.6 x 3.6 x 0.75mm 3.6mm 3.6mm 0.75mm
RS Stock No. 170-4459
Mfr. Part No.XR88C681CJ-F
BrandEXAR
SGD9.904
Each (In a Tube of 27)
units
2 - - - 1Mbit/s - Surface Mount PLCC 44 5 V 16.66 x 16.66 x 3.68mm 16.66mm 16.66mm 3.68mm
RS Stock No. 913-4247
Mfr. Part No.XR16C854CJ-F
BrandEXAR
SGD28.15
Each (In a Tube of 19)
units
4 IrDA 128B 128B 2Mbit/s Yes Surface Mount PLCC 68 2.97 → 5.5 V 24.33 x 24.33 x 3.68mm 24.33mm 24.33mm 3.68mm
RS Stock No. 913-4225
Mfr. Part No.ST16C2550CQ48-F
BrandEXAR
SGD6.692
Each (In a Tray of 250)
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
New
RS Stock No. 190-1375
Mfr. Part No.MAX3109ETJ+
BrandMaxim
SGD11.66
Each (In a Pack of 2)
units
1 RS232, RS485 - - 24Mbit/s Yes Surface Mount TQFN 32 1.71 → 3.6 V 5.0 x 5.0 x 0.43mm 5mm 5.0mm 0.43mm
RS Stock No. 686-5945
Mfr. Part No.ST16C554DCQ64-F
BrandEXAR
SGD11.83
Each
units
4 - 16B 16B 1.5Mbit/s Yes Surface Mount LQFP 64 2.97 → 5.5 V 10.1 x 10.1 x 1.45mm 10.1mm 10.1mm 1.45mm
RS Stock No. 124-2420
Mfr. Part No.SC16C2550BIB48,151
BrandNXP
SGD6.58
Each (In a Tray of 250)
units
2 UART 16B 16B 5Mbit/s Yes Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7.1 x 7.1 x 1.6mm 7.1mm 7.1mm 1.6mm
RS Stock No. 622-7964
Mfr. Part No.MAX3100CEE+
BrandMaxim
SGD9.85
Each
units
1 IrDA 16B 16B 0.23MBd - Surface Mount QSOP 16 2.7 → 5.5 V 4.98 x 3.99 x 1.55mm 4.98mm 3.99mm 1.55mm
RS Stock No. 923-1616
Mfr. Part No.FT240XQ-R
BrandFTDI Chip
SGD2.714
Each (On a Reel of 5000)
units
1 SIE 512B 512B 1Mbit/s Yes Surface Mount QFN 24 5 V 4 x 4 x 0.75mm 4mm 4mm 0.75mm
RS Stock No. 725-8843
Mfr. Part No.SC16C550BIB48,128
BrandNXP
SGD3.91
Each
units
1 UART 16B 16B 3Mbit/s - Surface Mount LQFP 48 2.5 V, 3.3 V, 5 V 7 x 7 x 1.4mm 7mm 7mm 1.4mm
RS Stock No. 686-5995
Mfr. Part No.XR16L788CQ-F
BrandEXAR
SGD34.93
Each
units
8 IrDA 64B 64B 6.25Mbit/s Yes Surface Mount PQFP 100 2.97 → 5.5 V 20.1 x 14.1 x 3.05mm 20.1mm 14.1mm 3.05mm
RS Stock No. 662-3915
Mfr. Part No.TL16C550CFNR
SGD6.386
Each (In a Pack of 5)
units
1 - 16B 16B 1MBd Yes Surface Mount PLCC 44 3 → 5.25 V 16.59 x 16.59 x 4.06mm 16.59mm 16.59mm 4.06mm
RS Stock No. 913-4228
Mfr. Part No.ST16C2550IQ48-F
BrandEXAR
SGD6.80
Each (In a Tray of 250)
units
2 RS232, RS485 16B 16B 4Mbit/s Yes Surface Mount TQFP 48 2.97 → 5.5 V 7.1 x 7.1 x 1.05mm 7.1mm 7.1mm 1.05mm
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